Definify.com
Webster 1913 Edition
Chapeau
1.
A hat or covering for the head.
2.
(Her.)
A cap of maintenance. See
Maintenance
. ‖Chapeau bras
[F.
, chapeau
hat + bras
arm]a hat so made that it can be compressed and carried under the arm without injury. Such hats were particularly worn on dress occasions by gentlemen in the 18th century. A chapeau bras is now worn in the United States army by general and staff officers.
Webster 1828 Edition
Chapeau
CHAPEAU
,Noun.